[Azure] Added api for obtaining all workflow run instances

Aalekh Jainrequested to merge
getAllRunInstancesAzure into master

GET - /v1/workflow/{workflow_name}/workflowRun

List of changes done as part of this MR

  1. Added implement for get all run instances of workflow
  2. Parameters supported for this api - prefix, limit, cursor, startDate, endDate
  3. Added UTs
  4. Added ITs

Refer #105

Edited by Aalekh Jain

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